usb: r8a6659: Fix build by missing of parenthesis

By commit c7e3b2b5, this was chanded to support multiple controllers.
But this has missing of parenthesis. This commit fix it.

-----
r8a66597-hcd.c: In function ‘usb_lowlevel_init’:
r8a66597-hcd.c:911:52: error: expected declaration specifiers before ‘)’
token
r8a66597-hcd.c:935:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or‘__attribute__’ before ‘{’ token
r8a66597-hcd.c:939:1: error: expected ‘{’ at end of input
-----

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
CC: Lucas Stach <dev@lynxeye.de>

drivers/usb/host/r8a66597-hcd.c

@@ -903,7 +903,7 @@ int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	return 0;
 }
 
-int usb_lowlevel_init(int index, void **controller))
+int usb_lowlevel_init(int index, void **controller)
 {
 	struct r8a66597 *r8a66597 = &gr8a66597;